The last words of a man who tried to save one of the planes from being hijacked during 9/11 were heard over the radio.
It's been almost 23 years since the single deadliest terrorist attack on the US in its 243-year history, but the tragic event still lives long in the memory.
The whole world was watching when 19 terrorists hijacked four aircrafts, as American Airlines Flight 11 and United Airlines Flight 175 crashed into the World Trade Centre in New York City.
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At the same time, American Airlines Flight 77 crashed into the Pentagon in Washington D.C - originally headed for the White House - and United Airlines Flight 93 flew towards the capital.
However, it crashed in a field in Pennsylvania following a passenger revolt against the hijackers.
The attack killed 2,977 people across the three destinations, with nobody on any of the flights surviving.
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Audio recordings obtained from the flights on that fateful day have resurfaced, and give us an insight into how terrifying it was onboard any of the four planes while they were being hijacked.
One of the recordings picked up was that from Todd Beamer, an account manager for the Oracle Corporation who lived in Cranbury, New Jersey.
He was aboard United Airlines Flight 93, which eventually crashed in a field in Stonycreek Township near Shanksville, Pennsylvania.
Along with his wife Lisa, he was survived by sons David and Drew, and daughter Morgan Kay, who was born four months after 9/11.
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Beamer, along with several other passengers, was in communication with people through in-plane and cell phones, as they all learnt that the World Trade Centre had been attacked with hijacked commercial airplanes.
The account manager tried to place a credit card call through an in-flight telephone, but was instead routed to a customer-service representative then a supervisor named Lisa Jefferson.
He told her that a passenger was killed, before being told by the flight attendant that the pilot and co-pilot had been forced out of the cockpit and possibly wounded.
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Jefferson then heard his panic when the plane suddenly turned in a southeasterly direction, later telling her that that some of the plane's passengers planned to 'jump on' the hijackers.
The supervisor said that Beamer's last audible words were: "Are you guys ready? Let's roll."
His line became so iconic that it would later become the war cry for American soldiers that would fight Al Qaeda in Afghanistan in the years following.
It was widely believed that passengers onboard purposely crashed the airliner to save the lives of those on the ground, however the 9/11 Commission's findings - which is based on the 'black box' cockpit recordings - revealed that the passengers of Flight 93 did not intentionally do this.
The passengers actually burst into the cockpit and fought with the terrorists over control of the plane.
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Unfortunately, the plane crashed into a field and killed everyone onboard, but nobody on the ground.
A post office in Cranbury, New Jersey, was named after Beamer, as well as the Todd Beamer high school in Federal Way, Washington.
Wheaton College also named a building after the hero, calling it the Todd M. Beamer Student Center.
A national hero, Beamer is often credited with helping to save the US capital from any further damage, though the efforts of everyone on board Flight 93 have been commended.
Joshua Nair